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Pressure-optimised Fan P8 with PWM PST, 4-pin, 80mm, black.  Features:  PWM PST technology allows multiple fans to be connected (up to 5 recommended), synchronizing their operating speed based on the actual computer cooling demands. In this way, the entire cooling system operates more efficiently and quietly, and the total energy consumption is lower than when each fan / cooler is connected separately. Optimized for high static pressure. During the development of the new P8 PWM PST, special emphasis was placed on a focused airstream and thus a high static pressure. The fan guarantees extremely efficient cooling, even with increased air resistance. Therefore, the P8 PWM PST is particularly suitable for use on heatsinks and radiators. High quality bearing. Thanks to an alloy/lubricant combination developed in Germany, friction within the bearing is reduced and greater efficiency is achieved. As a result, there is less heat development as well as less bearing noise, which means you can enjoy a longer service life from your fan. Maximum quietness, minimum vibration. Even at low speeds, the operating sound of the new ARCTIC motor is barely noticeable. Due to sinus-magnetizing the new motor only creates about 5 % of the vibration from the commutation of a regular DC motor without a filter. Consequently, there is no need for rubber spacers due to the steady and smooth torque of the new motor. 200 to 3000 rpm regulated via PWM PST. In this way, noise is kept at a minimum while maximum cooling performance is guaranteed when needed. Extended life span. A 10°C lower motor temperature roughly doubles the life span of a fan. The new ARCTIC motor has a four times longer service life through its low coil temperature. Therefore, these fans are covered by a 6-year manufacturer's warranty. Two way installation. Push warm air out of the case. Pull cool air into your case.  Specifications:  Speed: 200-3000 rpm. Air flow: 23.4 CFM / 39.76 mі / h. Static pressure: 1.9 (mm/H2O). Noise level: 0.3 Sone. Bearing: fluid dynamic bearing. Voltage / current 0.09A / 12V DC. Starting voltage: 3.4V. Connector: 4-Pin-Connector + 4-Pin-Socket. Cable length: 400 mm. Color: black. Dimensions: 80x80x25 mm. Weight: 81 g.  Warranty: 6 years.